Select the incorrect statements from the following:
$A$. Digestive system in Platyhelminthes is incomplete.
$B$. Bilateral symmetry is a characteristic feature of adult Echinoderms.
$C$. Pseudocoelom is possessed by Aschelminthes.
$D$. Notochord is persistent throughout life in the class Chondrichthyes.
$E$. Members of class Reptilia maintain a constant body temperature.

Which one of the following animals is correctly matched with its one characteristic and the taxon?

Which of the following statements are true/false?
$(i)$ In $Torpedo$,the electric organs are capable of generating strong electric shock to paralyze the prey.
$(ii)$ Bony fishes use pectoral,pelvic,dorsal,anal,and caudal fins in swimming.
$(iii)$ Amphibian skin is moist and has thick scales.
$(iv)$ Birds are poikilothermic animals.
$(v)$ The most unique mammalian characteristic is the presence of milk-producing mammary glands by which the young ones are nourished.

What is the exoskeleton of fish made of?

Match the animals in Column-$I$ with their common names in Column-$II$.

Column-$I$	Column-$II$
$(a)$. Limulus	$(i)$. Tusk shell
$(b)$. Ophiura	$(ii)$. Tapeworm
$(c)$. Taenia	$(iii)$. Brain coral
$(d)$. Meandrina	$(iv)$. King crab
$(e)$. Dentalium	$(v)$. Brittle star

State the location and function of the following:
$(i)$ Nephridia
$(ii)$ Mantle cavity